henry | Definition, meaning & more | Collins Dictionary Definitions noun (Electrical engineering: Circuits, Electrical power, Computing and control) A henry is a unit of electric inductance that is equal to 1 volt in a closed circuit when the electric current in the circuit varies uniformly at the rate of 1 ampere per second. ⇒ An inductor's ability to store magnetic energy is measured by its inductance, in units of henries. ⇒ One henry of inductance exists when one volt of electromotive force is induced when the current is changing at the rate of one ampere per second. ⇒ A henry is a unit of electric inductance that is equal to 1 volt in a closed circuit when the electric current in the circuit varies uniformly at the rate of 1 ampere per second. Word originsThis word is named for Joseph Henry (1797-1878), the American physicist who discovered several important principles of electromagnetism. Collins English Dictionary. Copyright © Harper Collins Publishers Example sentences containing 'henry' I put his companion down as soft , probably public school, a hooray henry.

Malcolm, John WHISTLER IN THE DARK Inductance unit conversion - SI derived quantity Inductance unit conversion - SI derived quantity ›› SI derived quantity: inductance This category of measurement units is defined by the "inductance" type, which is an SI derived quantity. ›› SI unit: henry The SI derived unit for inductance is the henry. ›› Convert henry to another unit Convert henry to Measurement unit conversion: TH Measurement unit conversion: TH The SI derived unit for inductance is the henry. 1 henry is equal to 1.0E-12 TH. ›› Convert TH to another unit Convert TH to Valid units must be of the inductance type. You can use this form to select from known units: Convert TH to I'm feeling lucky, show me some random units ›› Definition: Terahenry The SI prefix "tera" represents a factor of 1012, or in exponential notation, 1E12. So 1 terahenry = 1012 henries. The definition of a henry is as follows: The henry (symbol: H) is the SI unit of inductance.

It is named after Joseph Henry (1797-1878), the American scientist who discovered electromagnetic induction independently of and at about the same time as Michael Faraday (1791-1867) in England. Online Unit Converters • Electrical Engineering • Inductance • Unit definitions henry A henry (H) is the SI derived unit of inductance. Henry is defined as the inductance of a circuit, in which changing of current with the rate of one ampere per second creates electromotive force of one volt. A henry can be expressed in other SI units as follows: [H] = [m²·kg/C² = [V·s/A] = [J/A²] = [Ω·s] = [Wb/A]. exahenry An exahenry (EH) is a decimal multiple of the SI derived unit of inductance henry. Henry is defined as the inductance of a circuit, in which changing of current with the rate of one ampere per second creates electromotive force of one volt.

A henry can be expressed in other SI units as follows: [H] = [m²·kg/C² = [V·s/A] = [J/A²] = [Ω·s] = [Wb/A]. petahenry A petahenry (PH) is a decimal multiple of the SI derived unit of inductance henry. Henry is defined as the inductance of a circuit, in which changing of current with the rate of one ampere per second creates electromotive force of one volt. A henry can be expressed in other SI units as follows: [H] = [m²·kg/C² = [V·s/A] = [J/A²] = [Ω·s] = [Wb/A]. terahenry A terahenry (TH) is a decimal multiple of the SI derived unit of inductance henry. Henry is defined as the inductance of a circuit, in which changing of current with the rate of one ampere per second creates electromotive force of one volt.

A henry can be expressed in other SI units as follows: [H] = [m²·kg/C² = [V·s/A] = [J/A²] = [Ω·s] = [Wb/A]. gigahenry A gigahenry (GH) is a decimal multiple of the SI derived unit of inductance henry. Henry is defined as the inductance of a circuit, in which changing of current with the rate of one ampere per second creates electromotive force of one volt. A henry can be expressed in other SI units as follows: [H] = [m²·kg/C² = [V·s/A] = [J/A²] = [Ω·s] = [Wb/A]. megahenry A megahenry (MH) is a decimal multiple of the SI derived unit of inductance henry. Henry is defined as the inductance of a circuit, in which changing of current with the rate of one ampere per second creates electromotive force of one volt.

A henry can be expressed in other SI units as follows: [H] = [m²·kg/C² = [V·s/A] = [J/A²] = [Ω·s] = [Wb/A]. kilohenry A kilohenry (kH) is a decimal multiple of the SI derived unit of inductance henry. Henry is defined as the inductance of a circuit, in which changing of current with the rate of one ampere per second creates electromotive force of one volt. A henry can be expressed in other SI units as follows: [H] = [m²·kg/C² = [V·s/A] = [J/A²] = [Ω·s] = [Wb/A]. hectohenry A hectohenry (hH) is a decimal multiple of the SI derived unit of inductance henry. Henry is defined as the inductance of a circuit, in which changing of current with the rate of one ampere per second creates electromotive force of one volt.

A henry can be expressed in other SI units as follows: [H] = [m²·kg/C² = [V·s/A] = [J/A²] = [Ω·s] = [Wb/A]. dekahenry A dekahenry (daH) is a decimal multiple of the SI derived unit of inductance henry. Henry is defined as the inductance of a circuit, in which changing of current with the rate of one ampere per second creates electromotive force of one volt. A henry can be expressed in other SI units as follows: [H] = [m²·kg/C² = [V·s/A] = [J/A²] = [Ω·s] = [Wb/A]. decihenry A decihenry (dH) is a decimal fraction of the SI derived unit of inductance henry. Henry is defined as the inductance of a circuit, in which changing of current with the rate of one ampere per second creates electromotive force of one volt.

A henry can be expressed in other SI units as follows: [H] = [m²·kg/C² = [V·s/A] = [J/A²] = [Ω·s] = [Wb/A]. centihenry A centihenry (cH) is a decimal fraction of the SI derived unit of inductance henry. Henry is defined as the inductance of a circuit, in which changing of current with the rate of one ampere per second creates electromotive force of one volt. A henry can be expressed in other SI units as follows: [H] = [m²·kg/C² = [V·s/A] = [J/A²] = [Ω·s] = [Wb/A]. millihenry A millihenry (mH) is a decimal fraction of the SI derived unit of inductance henry. Henry is defined as the inductance of a circuit, in which changing of current with the rate of one ampere per second creates electromotive force of one volt.

A henry can be expressed in other SI units as follows: [H] = [m²·kg/C² = [V·s/A] = [J/A²] = [Ω·s] = [Wb/A]. microhenry A microhenry (μH) is a decimal fraction of the SI derived unit of inductance henry. Henry is defined as the inductance of a circuit, in which changing of current with the rate of one ampere per second creates electromotive force of one volt. A henry can be expressed in other SI units as follows: [H] = [m²·kg/C² = [V·s/A] = [J/A²] = [Ω·s] = [Wb/A]. nanohenry A nanohenry (nH) is a decimal fraction of the SI derived unit of inductance henry. Henry is defined as the inductance of a circuit, in which changing of current with the rate of one ampere per second creates electromotive force of one volt.

A henry can be expressed in other SI units as follows:[H] = [m²·kg/C² = [V·s/A] = [J/A²] = [Ω·s] = [Wb/A]. picohenry A picohenry (pH) is a decimal fraction of the SI derived unit of inductance henry. Henry is defined as the inductance of a circuit, in which changing of current with the rate of one ampere per second creates electromotive force of one volt. A henry can be expressed in other SI units as follows: [H] = [m²·kg/C² = [V·s/A] = [J/A²] = [Ω·s] = [Wb/A]. femtohenry A femtohenry (fH) is a decimal fraction of the SI derived unit of inductance henry. Henry is defined as the inductance of a circuit, in which changing of current with the rate of one ampere per second creates electromotive force of one volt.

A henry can be expressed in other SI units as follows: [H] = [m²·kg/C² = [V·s/A] = [J/A²] = [Ω·s] = [Wb/A]. attohenry An attohenry (aH) is a decimal fraction of the SI derived unit of inductance henry. Henry is defined as the inductance of a circuit, in which changing of current with the rate of one ampere per second creates electromotive force of one volt. A henry can be expressed in other SI units as follows: [H] = [m²·kg/C² = [V·s/A] = [J/A²] = [Ω·s] = [Wb/A]. Learn Technical English with Our Videos! You can use this online converter to convert between several hundred units (including metric, British and American) in 76 categories, or several thousand pairs including acceleration, area, electrical, energy, force, length, light, mass, mass flow, density, specific volume, power, pressure, stress, temperature, time, torque, velocity, viscosity, volume and capacity, volume flow, and more.

Note: Integers (numbers without a decimal period or exponent notation) are considered accurate up to 15 digits and the maximum number of digits after the decimal point is 10. In this calculator, E notation is used to represent numbers that are too small or too large. E notation is an alternative format of the scientific notation a · 10x. For example: 1,103,000 = 1.103 · 106 = 1.103E+6. Here E (from exponent) represents “· 10^”, that is “times ten raised to the power of”. E-notation is commonly used in calculators and by scientists, mathematicians and engineers. If you have noticed an error in the text or calculations, or you need another converter, which you did not find here, please let us know !

Convert millihenry [mH] <—> henry [H] • Electrical Engineering • Inductance • Compact Calculator Experiments Overview If we were to poll all of the people on the planet to see what they know about inductance, the majority would probably shrug their shoulders, even though inductance is the second most used concept in technology after the working principles of transistors. Inductance is so fundamental in technology that without it there would be no human civilization as we know it today. Those who love detective stories and who have enjoyed the captivating stories of Sir Arthur Conan Doyle about the adventures of the famous detective, Sherlock Holmes, may vaguely recall something related to this detective’s method to solve mysteries. In fact, they would be referring to the method of deductive reasoning, which, together with the method of inductive reasoning, is a form of reasoning used in Western philosophy and in formal logic. Inductive reasoning uses specific examples, properties, and principles to create a more general theory. Deductive reasoning works in the opposite direction, from the general theories, laws, and principles to a more specific case or example.

Despite the similarity of the terms “inductance” and “inductive reasoning”, they, in fact, have very little in common, except for the Latin root, inductio”, which means leading into or bringing in. Probably very few of the people who were polled would be able to explain what inductance is. They would likely be people who are familiar enough with physics, such as engineers, physicists, and students in these disciplines. Because inductance is such an important topic, some may actually be able to give a whole lecture on the subject. Definition of Inductance Inductance or coefficient of self-inductance in physics is a coefficient of proportionality L between the magnetic flow Ф around the conductor, which has electric current flowing through it, and the current I itself. A more specific definition is sometimes used that defines inductance as a coefficient of proportionality between the electric current that flows through a closed circuit and a magnetic flux, which is created by this electric current.

Ф = L•I or L = Ф/I To understand the physical function of an inductor in electric circuits we can use an analogy between the formula for energy, stored in this inductor when the electric current I runs through it, and the formula of mechanical kinetic energy of a body. Given a value for the electric current I, inductance L defines the energy W of the magnetic field, created by this electric current: Similarly, kinetic energy of a body is determined based on the mass of this body m, and its velocity V: That is, similar to mass, inductance prevents the energy of the magnetic field from increasing instantly, just like mass prevents the instant increase of the kinetic energy of the body. Let us observe how the electric current behaves in the inductor. Fig. 1. A circuit diagram of the experiment Fig. 2. Illustration of the experiment Fig. 3. A scope trace of the electric current running through the inductor. The yellow graph is the output signal of the generator and the blue graph is the signal on the resistor. The inertia of the inductor results in gradual increasing and decreasing of the edges of the square wave input signal.

In electric engineering a circuit like this is called an integrator circuit and is used to perform the mathematical operation known as integration. Let us examine the electric voltage on the inductor. Fig. 4. A circuit diagram of the experiment Fig. 6. A scope trace of the electric voltage across the inductor (blue line) When voltage is applied or removed, voltage surges occur because of the inductor’s electromotive force of self-inductance. In electric engineering, this type of circuit is called a differentiator circuit and is used to adjust rapid processes in the controlled object. Fig. 5. In general, motor windings in all electrical engines and generators of electric current, regardless of their type are, in fact, inductors Units Inductance in the SI is measured in henry (H). One henry represents induction of a circuit in which the rate of change of electric current by one ampere per second results in the output voltage of one volt. For the centimeter-gram-second (CGS) system, including the extended electromagnetic (EMU) and Gaussian systems of units, inductance is measured in cm (1 H = 10⁹ cm; 1 cm = 1 nH).

In some cases units called abhenry are used as an equivalent of a centimeter. In addition, in the extended electrostatic CGS (ESU) the unit for inductance is either left blank or referred to as stathenry. 1 stathenry ≈ 8.987552•10⁻¹¹ henry. The coefficient used to convert between stathenry and henry equals the square of the speed of light measured in cm/second, and multiplied by 10⁻⁹. Some History The letter L that is used to denote inductance is adopted to honor Heinrich Friedrich Emil Lenz (Russian: Эмилий Христианович Ленц), a Russian physicist who is renowned for studying electromagnetism and who formulated Lenz’s law that describes the behavior of magnetic circuits. The units for measuring inductance are named after Joseph Henry, who discovered self-inductance. The term “inductance” itself was suggested by Oliver Heaviside in February 1886.

Among the scientists who studied inductance and its diverse uses we should mention Henry Cavendish, who conducted electrical experiments; Michael Faraday, who discovered electromagnetic induction; Nikola Tesla, famous for his work on the electricity supply systems; André-Marie Ampère, who is considered a founder of electromagnetism; Gustav Robert Kirchhoff, who researched electric circuits; James Clerk Maxwell, who researched the electromagnetic field and the relationship between electricity, magnetism, and optics, as specific cases of the electromagnetic field; Heinrich Rudolf Hertz, who proved that the theory about electromagnetic waves was, in fact, true; Albert Abraham Michelson, and Robert Andrews Millikan. Of course every one of these scientists worked on many more problems, than the ones described above. Inductor Inductors can be made with helical coils, pancake coils, and a combination of the two. These coils are made of the insulated conductor and have relatively large inductance for relatively small capacity and resistance. As a result, when alternating electric current (AC) runs through the inductor, we can observe a significant lag, as described in the experiment above.

In the electronics that work with high frequencies, the inductor may consist of just one turn of the coil or even part of a turn. In the extreme cases when the frequencies are very high, a conductor with distributed inductance, also known as stripline is used for making inductors. Use of Inductors in Engineering Inductors are used in the following situations: Fig. 9. Inductors To suppress interference and noise, for surge control, energy storage, to limit alternating current, in resonant circuits (LC circuits) and frequency selective circuits, to create magnetic fields, in displacement sensors, in credit card readers, as well as in proximity cards. Inductors (together with capacitors and resistors) are used in various circuits with frequency-dependent properties, in particular in filters, feedback loop circuits, oscillating circuits and others. Corresponding to their uses, these inductors are called tuning coils, filter coils, and so on. Two connected inductors are used to make a transformer. An inductor that is powered by pulsating direct current from a transistor switch is sometimes used as a low power high voltage power supply in low current systems.

This is useful when using a separate high-voltage device in the power supply is logistically either impossible or difficult. In this case voltage surges occur on the inductor due to self-induction and they can be used in circuits. The inductors used to suppress noise, for surge control, to isolate high frequencies from the different parts of the circuit (decoupling), and to store energy in the magnetic field of the magnetic core are called chokes. When the inductor is used to limit the electric current in power transmission and distributions, for example when a short circuit failure occurs in the power transmission line, this inductor is called a reactor coil. Current limiters inside welding units are made in the form of an inductor and thus limit the current during arc welding. They make the arc more stable resulting in a more even and stronger welding seam. Inductors are also used as electromagnets, serving as actuators. Cylindrical inductors with the length that greatly exceeds their diameter are called solenoids. The magnetic field generated by the solenoid is uniform. Devices that perform mechanical work with the use of the magnetic field by drawing in its ferromagnetic plunger into the coil are also sometimes called solenoids.

Inductors inside the electromagnetic relays are called relay coils, and sometimes — an electromagnet. Special types of inductors are coils used in induction heaters. These heaters are used for cooking and in the industry. In general, motor windings in all electrical engines and generators of electric current, regardless of their type are, in fact, inductors. If we were to make an analogy with the ancient depiction of Earth being flat and standing on top of three elephants or three whales, we could say instead that it is resting on three inductors, because of the enormous importance of inductors in our lives. Fig 16. Earth magnetosphere Even the magnetic field of the Earth, which protects all of the living beings on our planet from cosmic and solar radiation, is possible, according to the main hypothesis about its emergence, because of the large current flowing in the melted metal core of the Earth. We could say that this core is, in fact, an enormous inductor. The zone, throughout which this magnetic field is most active, is about 0.25—0.3 radii of the Earth. Fig. 7. Magnetic field around a conductor that has electric current running through it.

Here I is the electric current and B — the vector for magnetic induction. Experiments Finally let us discuss some interesting properties of the inductors. You could observe them if you have simple tools and measuring devices, described below. For these experiments we would need some insulated copper wire, a ferrite rod and any modern multimeter, which allows you to measure inductance. Let us recall that any conductor that has current running through it creates a magnetic field around it as shown in Fig 7. Fig. 8. Magnetic field around a coil with electric current running through it. Wind forty turns of wire around the ferrite rod, making sure that the distance between turns is small. This would be inductor 1. Now wind the same number of turns with the same distance around another ferrite rod, but in the opposite direction. This would be inductor 2. Take another rod and wind twenty turns without any space between them, in any direction. This would be inductor 3. Now remove the wire from the ferrite rod. Instead of using three ferrite rods we could use one, removing it after we complete each coil. The magnetic field of these inductors looks something like the one shown in Fig 8. Fig.

10. Inductors can be divided into two kinds: those with a magnetic core and those with a non-magnetic core. Fig. 8 shows the non-magnetic core. Here air is acting as the core. Fig. 9 shows examples of inductors with a magnetic core, which can be either opened or closed. Fig. 11. Generally the core is made from ferrite or laminated silicon steel. A core increases the inductance of an inductor several times. Compared to a cylindrical core, a core shaped as a ring (toroidal core) creates greater inductance, because the magnetic flow in such a core is closed. Fig. 12. Now connect the multimeter probes to the leads of inductor 1 making sure that the probes are plugged into the ports for measuring inductance and the multimeter is set to measure inductance. Inductance of this inductor is very small, roughly several parts of a microhenry — this is why the multimeter shows no value (Fig. 10). Let us now start inserting the ferrite rod into the coil as shown in Fig. 11.

The multimeter indicates approximately 10 microhenrys, and as we move the inductor towards the center of the rod, inductance increases about threefold as shown in Fig 12. Fig 13. As we move the inductor towards the other side of the rod, the value for inductance decreases again. We can conclude that the inductance of the inductor can be controlled by moving the core inside of the inductor, and the maximum value is reached when the ferrite rod is centered inside the inductor. Through our experiments we created a very simple device called variometer. If we do the same experiment with inductor 2, we will find that the same pattern occurs. Thus, the direction of the turns does not matter. Fig 14. Let us now push the turns of inductor 1 or inductor 2 close together, so that there is no space between the turns, and measure the inductance. As we can see in Fig. 13, it increased. Fig 15. When we stretch out the coil along the rod, its inductance decreases, as shown in Fig. 14.

We can make a conclusion that changing the distance between the turns allows us to change inductance, and maximum inductance is achieved when the turns are wound tightly together. This last way of changing inductance by stretching or compressing the turns of the coil is often used in RF electronics. Let us now insert the ferrite rod inside inductor 3 and measure its inductance (Fig 15). Here the number of turns decreased two times, but the inductance decreased four times. We can conclude that the fewer turns there are — the lower the inductance, and this dependency between the number of turns and inductance is not linear. This article was written by Sergey Akishkin You can hide articles if you use this converter often. Cookies must be allowed in your browser. You may be interested in another converters in the Electrical Engineering group: Learn Technical English with Our Videos!

You can use this online converter to convert between several hundred units (including metric, British and American) in 76 categories, or several thousand pairs including acceleration, area, electrical, energy, force, length, light, mass, mass flow, density, specific volume, power, pressure, stress, temperature, time, torque, velocity, viscosity, volume and capacity, volume flow, and more. Note: Integers (numbers without a decimal period or exponent notation) are considered accurate up to 15 digits and the maximum number of digits after the decimal point is 10. In this calculator, E notation is used to represent numbers that are too small or too large. E notation is an alternative format of the scientific notation a · 10x. For example: 1,103,000 = 1.103 · 106 = 1.103E+6. Here E (from exponent) represents “· 10^”, that is “times ten raised to the power of”. E-notation is commonly used in calculators and by scientists, mathematicians and engineers. Select the unit to convert from in the left box containing the list of units.

Select the unit to convert to in the right box containing the list of units. Enter the value (for example “15”) into the left From box. The result will appear in the Result box and in the To box. Alternatively, you can enter the value into the right To box and read the result of conversion in the From and Result boxes. If you have noticed an error in the text or calculations, or you need another converter, which you did not find here, please let us know ! m m -1 The SI unit of plane angle. A radian is equal to the angle subtended at the centre of a circle by an arc of circumference equal in length to the circle's radius. The radian is therefore formally dimensionless, as it is a ratio of two lengths. There are 2*pi radians in a complete circle. Wikipedia m 2 m -2 The SI unit of solid angle, defined as the solid angle subtended at the centre of a sphere of radius r by a portion of the surface of the sphere having an area r^2. Since the surface area of a sphere is 4*pi*r^2, a sphere measures 4*pi steradians.

The steradian is the solid analogue of the radian, and like that unit, is formally dimensionless (in this case, being the ratio of two areas.) Wikipedia s -1 s -1 The SI derived unit of frequency, defined as one cycle per second. Periodically varying angles are typically not expressed in Hz, but instead in an appropriate angular unit (such as radians per second). Wikipedia m.kg.s -2 m.kg.s -2 The SI derived unit of force, defined as the force necessary to accelerate a mass of one kilogram at a rate of 1m s^-2. Named after Sir Isaac Newton, the Newton was adopted as the name for the MKS (direct predecessor of the SI) unit of force in 1948. A small apple, fittingly, exerts a gravitational force of about 1N on Earth. Sebastian Breuers m.kg.s-2.mole -1 The SI derived unit of force per mole, defined as the force necessary to accelerate a mass of one kilogram at a rate of 1m s^-2 in relation to one mole. Computational chemistry procedures like minimizations often need force per mole as abort criterion.

Wikipedia N m m2.kg.s -2 The SI derived unit of energy, defined as the energy required to exert a force of one newton for a distance of one metre. This is dimensionally, but not semantically, equivalent to the newton metre, which is typically used as a unit of torque. It is also, significantly, the work required to move an electric charge of one coulomb through an electric potential difference of one volt. Wikipedia J/s m2.kg.s -3 The SI derived unit of power, defined as one joule of energy per second. The watt dates back to the Second Congress of the British Association of the Advancement of Science in 1889, and is named after James Watt, one of the key engineers to the development of the steam engine. Wikipedia N/m 2 m-1.kg.s -2 The SI derived unit of pressure, equal to one newton per square metre. The pascal, named after Blaise Pascal, is also used to measure stress, Young's modulus, and tensile strength. For atmospheric pressures, however, it is commonly regarded as an inconveniently small unit.

Wikipedia s.A The SI unit of electric charge, defined as the amount of electric charge carried by a current of one ampere flowing for one second. Also the unit of electric flux. The Coulomb could, in principle, be defined in terms of the elementary charge of the electron and the Josephson and von Klitzing constants; in this case, the kilogram would become a derived rather than fundamental unit. Wikipedia W/A = J/C m2.kg.s-3.A -1 The SI unit of electric potential difference, defined as the potential difference across a conductor when a current of one ampere dissipates one watt of power. The number of volts is a measure of the strength of an electrical source in the sense of how much power is produced for a given current level. It is named in honor of Alessandro Volta (1745-1827), who invented the voltaic pile, the first chemical battery. Since 1990 the volt is maintained internationally for practical measurement using the Josephson effect.

Wikipedia V/A m2.kg.s-3.A -2 The SI unit of electrical impedance/resistance; a resistance of one ohm produces a potential difference of one volt when one ampere of current flows through it. Named after Georg Ohm, the German physicist who discovered Ohm's Law; since 1990, the unit has been internationally maintained using the Quantum Hall Effect and a conventional value for the von Klitzing constant. Wikipedia C/V m-2.kg-1.s4.A 2 The SI derived unit of capacitance, equal to one coulomb of stored charge causing a potential difference of one volt across the terminals of the capacitor being measured. Capacitance is a measure of the total amount of electric charge stored for a given electric potential. The farad is a very large unit; typical capacitors are in the microfarad to picofarad range. Although the farad is named after Michael Faraday, it should not be confused with the Faraday - an older unit of capacitance. Wikipedia [Omega] -1 m-2.kg -1 s3.A 2 The SI derived unit of electrical conductance, defined as the reciprocal of the system's electrical resistance.

This is equivalent to the obsolete "mho" unit (derived from spelling "ohm" backwards and written with an upside-down capital omega). Wikipedia m2.kg.s-2.A -1 m2.kg.s-2.A -1 The SI derived unit of magnetic flux; a change in flux of one weber per second through a loop will induce an electromotive force of one volt. The weber, like the farad, is a very large unit. Wikipedia V.s.m -2 = Wb/m 2 kg.s-2.A -1 The SI derived unit of magnetic flux density, defined as one weber per metre squared. The tesla is the value of the total magnetic flux (in some sense, the "power" of a magnet) over area; hence reducing the affected area generally increases the magnetic flux density. Like many of the other electromagnetic units, one tesla is very large.

Wikipedia V.s.A -1 = Wb/A m2.kg.s-2.A -2 The SI derived unit of magnetic inductance; a circuit with an inductance of one henry gives rise to an EMF of one volt when the rate of change of current in the circuit is 1 A.s^-1. Inductance is a measure of how much magnetic flux is produced for a given circuit. Wikipedia s -1 s -1 The SI derived unit of radioactivity, defined as the activity of a quantity of radioactive material in which one nucleus decays per second. This, therefore, has the same dimensionality as the hertz (s^-1, reciprocal time) - a frequency, in other words. The reason for having a specific unit for radioactivity is slightly unusual; it was specifically introduced because of the dangers to human health which might arise from mistakes involving the units reciprocal second. Using the becquerel unit, a more active (and so, all the other things fixed, more dangerous) source has a higher number. Using 1/s or s as a second instead may lead to confusion.

Wikipedia J/kg m2.s -2 The SI derived unit of absorbed radioactive dose, defined as the absorption of one joule of radiation energy by one kilogram of matter. Note that these are the same units as the sievert. To avoid any risk of confusion between the absorbed dose and the equivalent dose, one must use the corresponding special units, namely the gray instead of the joule per kilogram for absorbed dose and the sievert instead of the joule per kilogram for the dose equivalent. Wikipedia J/kg m2.s -2 The SI derived unit of equivalent radioactive dose, equal to the absorbed dose in grays multiplied by two dimensionless constants - Q, dependent on radiation type, and N dependent on all other factors. The sievert attempts to reflect the biological effects of radiation as opposed to the physical aspects, which are characterised by the absorbed dose, measured in grays. Note that these are the same units as the sievert. To avoid any risk of confusion between the absorbed dose and the equivalent dose, one must use the corresponding special units, namely the gray instead of the joule per kilogram for absorbed dose and the sievert instead of the joule per kilogram for the dose equivalent.

Wikipedia mol/s s-1.mol The derived SI unit for expressing quantity values of catalytic activity, in mol s^-1. The katal is not used to express the rate of a reaction; that is expressed in moles per second. Rather, it is used to express catalytic activity which is a property of the catalyst. The katal is invariant of the measurement procedure, but the numerical quantity value is not and depends on the experimental conditions. Therefore, in order to define the quantity of a catalyst, the rate of conversion of a defined chemical reaction has to be specified, preferably of the first order, under strictly controlled conditions. Wikipedia Rate of change in concentration expressed in units of moles per cubic metre per second [moles m-3 s-1]. Rate of change in concentration expressed in units of moles per cubic metre per second [moles m-3 s-1]. Wikipedia Rate of change in concentration expressed in units of moles per cubic decimetre per second [moles dm-3 s-1]. Rate of change in concentration expressed in units of moles per cubic decimetre per second [moles dm-3 s-1].

Wikipedia kg.m2.s-2.K -1 Derived SI unit of absolute heat capacity. This should not be confused with molar heat capacity; this unit pays no regard to the quantity of material being heated. Wikipedia kg.m2.s-2.K-1.mol -1 Derived SI unit of heat capacity per mole Molar heat capacity is the standard unit for heat capacity measurements in chemistry; it should not be confused with absolute heat capacity. Wikipedia m2.s-2.K -1 Derived SI unit of specific heat capacity Heat capacity can be measured in three ways; per number (eg. per mole), per unit mass (as here), or in absolute terms. Care must be taken not to confuse which of these units is relevant to any given measurement! Wikipedia

Question: What is the SI derived unit of inductance?
Answer: HENRY